Hate to break it to you but you can't avoid grinding in some shape or form. The easiest way is to do Roc strikes. You get engrams, vanguard rank, and vanguard marks. Use the marks and rank to buy yourself some armor and guns. Hope RNG gives you exotics at the end of the strikes. Then use the blue engrams and hope for strange coins to buy an exotic from Xur. Otherwise you can do the nightfall, but since you're level 24 you won't be doing that for a while. When you hit 27 or 28 try VoG on normal. The gear's not great but it's a stepping stone. Plus you can always break the stuff down for resources. Also the odd chance for an exotic from certain chests or Atheon never hurt.